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Switching converter and control circuit thereof

A technology of switching converters and control circuits, which is applied to electrical components, output power conversion devices, etc., can solve the problems of large power consumption of circuits, the output voltage of switching converters cannot reach the preset value, and wide DC working range, etc., to achieve The effect of simple circuit form

Active Publication Date: 2017-01-04
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the slope compensation will introduce a DC error, so that the output voltage of the switching converter cannot reach the preset value, and an error amplifier needs to be introduced to eliminate the DC error
However, the DC operating range of the error amplifier is usually very wide, making the circuit consume more power

Method used

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  • Switching converter and control circuit thereof
  • Switching converter and control circuit thereof
  • Switching converter and control circuit thereof

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Embodiment Construction

[0011] Specific embodiments of the present invention will be described in detail below, and it should be noted that the embodiments described here are only for illustration, not for limiting the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In other instances, well-known circuits, materials or methods have not been described in detail in order to avoid obscuring the present invention.

[0012] Throughout this specification, reference to "one embodiment," "an embodiment," "an example," or "example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in the present invention. In at least one embodiment. Thus, appearances of the phrases "in on...

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Abstract

The invention discloses a switching converter. The switching converter contains a boost or buck switching converter. The switching converter includes a control circuit. The control circuit includes a ramp generation circuit, an error amplifier and a calibration circuit. The ramp generation circuit filters the square-wave voltage at a switch node of the switching converter so as to generate a ramp signal. The calibration circuit filters the ramp signal so as to generate a calibration signal. The generated calibration signal can lower the DC working range of the error amplifier so as to reduce power consumption of a system. Since the calibration signal is obtained by filtering the ramp signal, the circuit has simple form.

Description

technical field [0001] The present disclosure relates to electronic circuits, and more particularly, the present disclosure relates to switching converters and control circuits thereof. Background technique [0002] The constant on-time controlled switching converter includes an output capacitor, which can be equivalent to a series structure of an equivalent resistance and an ideal capacitance. When the ESR impedance value of the output capacitor is small, the constant on-time controlled switching converter is prone to oscillation, and a slope compensation circuit is required to stabilize the system. However, the slope compensation will introduce a DC error, so that the output voltage of the switching converter cannot reach a preset value, and an error amplifier needs to be introduced to eliminate the DC error. However, the DC operating range of the error amplifier is usually very wide, making the circuit consume more power. A circuit needs to be proposed to reduce the dc ...

Claims

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Application Information

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IPC IPC(8): H02M1/00
CPCH02M1/00H02M1/0003
Inventor 李磊
Owner CHENGDU MONOLITHIC POWER SYST
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